networkd: show wireguard private key read error number

Noticed while looking at #35641

(cherry picked from commit 0543b02cf8211353c0bb1065e09614f551944a41)
(cherry picked from commit b5dc1922f9bd0a64cf17be8c503baba58bf5ba82)

diff --git a/src/network/netdev/wireguard.c b/src/network/netdev/wireguard.c
index fed1be8d1104613d37408b18e8f186b0df44f0b4..158eb4b379ce99fa85662e10d4283dcb91609c28 100644 (file)
--- a/src/network/netdev/wireguard.c
+++ b/src/network/netdev/wireguard.c
@@ -1172,7 +1172,7 @@ static int wireguard_verify(NetDev *netdev, const char *filename) {
         r = wireguard_read_key_file(w->private_key_file, w->private_key);
         if (r < 0)
                 return log_netdev_error_errno(netdev, r,
-                                              "Failed to read private key from %s. Ignoring network device.",
+                                              "Failed to read private key from '%s', ignoring network device: %m",
                                               w->private_key_file);
 
         if (eqzero(w->private_key)) {